A325 Heavy Hex Bolt
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A325 Heavy Hex Bolt

ASTM F3125 Grade A325 heavy hex bolts are high strength structural bolts manufactured from medium carbon steel, carbon boron, or medium carbon alloy steel. A325 hex bolts are available in diameters from 1/2" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.6. Grade markings consists of both the grade symbol "A325" and the manufacturer's identification mark. Inch series fasteners meeting ASTM F3125 Grade A325 specifications are intended for use in steel to steel structural connections. Grade A325 heavy hex bolts offer a heavy pattern head to increase the bearing surface and distribute the clamping load over a larger area.

Governing StandardsA325

ASTM F3125 Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.6 Covers the general and dimensional data for five products in the inch series recognized as American National Standard. These five structural products include: (a) Heavy Hex Structural Bolts: ASTM A 325 or ASTM A 490; (b) Heavy Hex Nuts: ASTM A 563; (c) Hardened Steel Washers; Circular, Circular Clipped or Beveled: ASTM F436; (d) Compressible Washer-Type Direct Tension Indicators: ASTM F 959; (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F1852.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
SC Slip Critical Connection
N Bearing type connection with threads in the shear plane.
X Bearing type connection with no threads in the shear plane.

A325 Head Marking
A325 Material Marking

Mechanical PropertiesA325

Alloy Steel, Quenched & Tempered Per ASTM F3125/F3125M-15a
Grade A325 Tensile
Strength
Yield
Strength
Elongation
in 4D
Reduction
in Area
Min psi Min psi Min % Min %
Inch 120 ksi 120,000 92,000 14 35

Chemical PropertiesA325

Per ASTM F3125/F3125M-15a
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Boron
% by weight % by weight % by weight % by weight % by weight % by weight
A325 Type 1 Carbon or Alloy Steel with or without Boron 0.30-0.52 0.60 min 0.035 max 0.040 max 0.15-0.30 0.003 max

Dimensional SpecificationsA325

Heavy hex bolt dimensions
Per ASME B18.2.6-2010
Nominal Diameter UNC UNF E F G H LT Y
Body Diameter Width Across Flats Width Across Corners Head Height Thread Length Transition Length
Max Min Basic Max Min Max Min Basic Max Min Ref Max
1/2 0.500 13 20 0.515 0.482 7/8 0.875 0.850 1.010 0.969 11/32 0.364 0.302 1.000 0.190
5/8 0.625 11 18 0.642 0.605 1 1/16 1.062 1.031 1.227 1.175 27/64 0.444 0.378 1.250 0.220
3/4 0.750 10 16 0.768 0.729 1 1/4 1.250 1.212 1.443 1.383 1/2 0.524 0.455 1.380 0.250
7/8 0.875 9 14 0.895 0.852 1 7/16 1.438 1.394 1.660 1.589 37/64 0.604 0.531 1.500 0.280
1 1.000 8 14 1.022 0.976 1 5/8 1.625 1.575 1.876 1.796 43/64 0.700 0.591 1.750 0.310
1 1/8 1.125 7 12 1.149 1.098 1 13/16 1.812 1.756 2.093 2.002 3/4 0.780 0.658 2.000 0.340
1 1/4 1.250 7 12 1.277 1.223 2 2.000 1.938 2.309 2.209 27/32 0.876 0.749 2.000 0.380
1 3/8 1.375 6 12 1.404 1.345 2 3/16 2.188 2.119 2.526 2.416 29/32 0.940 0.810 2.250 0.440
1 1/2 1.500 6 12 1.531 1.470 2 3/8 2.375 2.300 2.742 2.622 1 1.036 0.902 2.250 0.440
  1. All dimensions are in inches.
A325 Heavy Hex Bolt
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Diameter Thread Pitch Length Threading Origin Item # Availability Price Quantity UOM
1/2 13 1 1/4 Partial Unrestricted Origin 325B0500125-I In Stock $0.40832/EA EA
1/2 13 1 1/2 Partial North American 325B0500150-U 3-5 Working Days $0.43713/EA EA
1/2 13 1 3/4 Partial Unrestricted Origin 325B0500175-I In Stock $0.29673/EA EA
1/2 13 2 Partial Unrestricted Origin 325B0500200-I In Stock $0.87605/EA EA
1/2 13 2 3/4 Partial North American 325B0500275-U 3-5 Working Days $1.50411/EA EA
5/8 11 1 1/2 Full North American 325B0620150-U 3-5 Working Days $0.71199/EA EA
5/8 11 1 3/4 Partial Unrestricted Origin 325B0620175-I In Stock $0.9008/EA EA
5/8 11 2 Partial Unrestricted Origin 325B0620200-I In Stock $0.93664/EA EA
5/8 11 2 1/4 Partial North American 325B0620225-U 3-5 Working Days $0.71034/EA EA
5/8 11 2 1/2 Partial Unrestricted Origin 325B0620250-I In Stock $0.56627/EA EA
3/4 10 1 3/4 Partial Unrestricted Origin 325B0750175-I In Stock $0.8785/EA EA
3/4 10 2 Partial Unrestricted Origin 325B0750200-I In Stock $1.03615/EA EA
3/4 10 2 1/4 Partial Unrestricted Origin 325B0750225-I In Stock $0.98966/EA EA
3/4 10 2 1/2 Partial Unrestricted Origin 325B0750250-U 3-5 Working Days $1.87572/EA EA
3/4 10 2 3/4 Partial Unrestricted Origin 325B0750275-I In Stock $1.12357/EA EA
3/4 10 3 Partial Unrestricted Origin 325B0750300-I 3-5 Working Days $1.19859/EA EA
3/4 10 3 1/4 Partial Unrestricted Origin 325B0750325-I In Stock $1.03539/EA EA
3/4 10 3 1/2 Partial Unrestricted Origin 325B0750350-I In Stock $1.10886/EA EA
3/4 10 4 Partial North American 325B0750400-U 3-5 Working Days $2.76313/EA EA
3/4 10 4 1/2 Partial North American 325B0750450-U 3-5 Working Days $2.91892/EA EA
7/8 9 1 3/4 Partial Unrestricted Origin 325B0870175-I In Stock $3.58108/EA EA
7/8 9 2 Partial Unrestricted Origin 325B0870200-I In Stock $1.60266/EA EA
7/8 9 2 1/4 Partial Unrestricted Origin 325B0870225-I In Stock $1.55342/EA EA
7/8 9 2 1/2 Partial Unrestricted Origin 325B0870250-I In Stock $1.65972/EA EA
7/8 9 3 1/2 Partial Unrestricted Origin 325B0870350-I In Stock $1.62162/EA EA
1 8 3 Partial North American 325B1000300-U 3-5 Working Days $4.34783/EA EA
1 8 3 1/2 Partial North American 325B1000350-I In Stock $2.84371/EA EA
1 8 3 3/4 Partial North American 325B1000375-I In Stock $2.97297/EA EA
1 8 4 Partial North American 325B1000400-I In Stock $3.87779/EA EA